Metallized Barrier Material

Abstract

A metallized barrier material comprising a base material, a first protective coating, a metallized layer, and a second protective coating. The base material has a first surface and a second surface. The base material is a dimensionally stable porous substrate. The first protective coating is applied to the first surface of the base material. The metallized layer is vapor deposited on the protective first surface of the base material to a desired optical density. The second protective coating applied to the metallized layer.

1 . A metallized barrier material comprising:
 a base material having a first surface and a second surface, the base material being a dimensionally stable porous substrate;   a first protective coating applied to the first surface of the base material;   a metallized layer vapor deposited on the protective first surface of the base material to a desired optical density;   a second protective coating applied to the metallized layer.   
     
     
         2 . The metallized barrier material of  claim 1  wherein the base material comprises one of a cellulosic based material or a biopolymer. 
     
     
         3 . The metallized barrier material of  claim 2  further comprising a third protective coating applied to the second surface of the base material. 
     
     
         4 . The metallized barrier material of  claim 2  wherein the base material is selected from the group consisting of: PLA, PHA, thermoplastic starches, blends thereof and cellulosic materials. 
     
     
         5 . The metallized barrier material of  claim 2  wherein at least one of the first protective coating and second protective coating comprises one or more of the group consisting of: Dianal BR87, MB2998, MB7107, PB588, PB586, PB419, BR-57, TB-120, TB-121, Cork FP-3105, FP-2877, Cork FP-3122ND, Cork PC-93V, Dow DER 661 and Epon 1031. 
     
     
         6 . The metallized barrier material of  claim 2  wherein the optical density of the metallized layer comprises 2.5 to 4.5. 
     
     
         7 . The metallized barrier material of claim wherein the MVTR in a tropical condition for 24 hours is less than 200 gsm. 
     
     
         8 . A method of making a metallized barrier material comprising the steps of:
 providing a base material having a first surface and a second surface, the base material being a dimensionally stable porous substrate;   applying a first protective coating in a solvent or water on the first surface of the base material;   evaporating the solvent or water;   vapor depositing a metallized layer on the first surface of the base material, to a desired optical density;   applying a second protective coating in a solvent or water onto the metallized layer; and   evaporating the solvent or water.   
     
     
         9 . The method of  claim 8  further comprising the step of:
 applying a second protective coating to the first surface of the base material before vapor depositing the metallized layer. 
 
     
     
         10 . The method of  claim 8  further comprising the step of applying a third protective coating to the second surface of the base material.